Helmets reduce head injuries to adults by 35% and to children under 13 by 59%, according to research at the University of Innsbruck, in Austria.

In the US, helmet use on the slopes has risen to nearly 50% and it is compulsory in many resorts.

Actress Natasha Richardson, wife of actor Liam Neeson, died after falling and hitting her head on a beginners’ run in Montreal in 2009, while singer Sonny Bono hit a tree and died in 1998. Neither of them wore a helmet.

Following Schumacher's accident, an emergency evacuation airlifted him off the slopes by helicopter while still conscious.

Tonight, respected local newspaper Dauphine Libere reported that the German's life was in danger.

A report filed at 7.20pm read: 'The state of health of the veteran driver has worsened and his condition is considered life-threatening, according to our information'.

The Dauphine is one of the most respected papers in the Alps, and has outstanding medical contacts.